Use the internet.
SOURCE: craftsman garage door opener instruction manual
Have you tried the manufacturers site at either craftsman or sears. You should be able to find it there. You will need your model #.
SOURCE: wayne dalton garage door is humming but wont open
Likely the plastic gears are worn out. Unplug the unit from power source, remove the cover, look at the gears. If worn, it will be obvious from the shavings from the gears. You can buy the gear kit on EBAY for a little as $20 depending on the manufacturer and model. Before removing the chain drive, lock a pair of vice grips on the chain and metal chain rail to keep the chain from turning from its current position. The gears can be replaced without removing the opener. Even if you have to remove the opener, it is a simple task. Most have four bolts that need to be removed and it will be in you hands.
SOURCE: My Wayne Dalton garage door will open with remote but not close
your infrared sensor is either misaligned, faulty, or you have a broken wire from your sensor to your door opener. (Flashing light indicates infrared light path is broken). both sensors should indicate green led. door wil not come down is safty feature to prevent door from closing when light path is broken.
SOURCE: wayne dalton classic drive 3018, door goes 90%
wayne dalton classic drive squeaks and binds then stops
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